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You can open the Code and modify the function: see the Help
HELP
Folium of Descartes: x = t/(1+t^3), y = t^2/(1+t^3), t in (-∞, ∞)
// --- base = height -- base = altezza ---- f blue, g green, h red, k orange ---- function f(x) { y = x; return y } function g(x) { y = x/2; return y } function h(x) { y = -(x-1/2)+1/2; return y } function k(x) { y = (x-4/9)*11/8+2/9; return y } ... aX = -0.8; bX = 0.8; aY = -0.8; bY = 0.8 Dx = 0.1; Dy = 0.1 ... xx=yy=[-0.5,0.5] Qx=[1/2,4/9]; Qy=[1/2,2/9] C0="brown" ... function XX(t) {x=t/(1+t*t*t); if(Ix(x)<1){x=1/0}; return x} function YY(t) {y=t*t/(1+t*t*t); if(Iy(y)<1){y=1/0}; return y}; t1=-100; t2=80 for(j=0;j<=5e3;j=j+1) {t=t1+(t2-t1)/5e3*(j-1);Lx[j]=XX(t);Ly[j]=YY(t)} ... AX=BX=AY=BY="" ... AAX=aX; BBX=bX; AAY=aY; BBY=bY ... linew=2; linef=1; lineg=1; lineh=1; linek=1 ... // se vuoi puoi porre linewN diverso da linew / you can set linewN different from linew linew=4 ...